Autumn Equinox in Several Hours

The center of the sun will pass over the Earth's equator (relatively speaking) within the next 24 hours heralding the end of summer for the northern hemisphere. It is to survive the cooler six months ahead that some wildlife have put on a little extra weight. The Autumnal equinox has an opposite equinox in spring named the vernal equinox.

• 

I was reading an interesting book recently with figures such as Tycho Brahe, Copernicus, Keplar, Galileo, Cassini and others notable for developing astronomy science and found a term called the Aries or Zero point.The ecliptic intersects the celestial equator. That happens in vernal equinox when the sun returns north. The Aries point is used to measure a year a little more accurately than a calender year.

http://ircamera.as.arizona.edu/astr_250/Lectures/LECTURE_01.HTM

There is a star 65 light years from Earth named Alpha Arietis believed to have a planet orbiting it. That is just a coincidence with the Aries or Zero point used by astronomers.

http://en.wikipedia.org/wiki/Alpha_Arietis